قارن الطرق

	تجربة معملية محظورة - تصميم القطاعات العشوائية في البيئات المعملية	التجربة العاملية
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1926–1935	1926–1935
صاحب الطريقة	Ronald A. Fisher	Ronald A. Fisher
النوع	Controlled experimental design with blocking	Quantitative experimental design
المصدر التأسيسي	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.
الأسماء البديلة	blocked lab experiment, laboratory randomized block design, RBD laboratory study, blocked within-lab experiment	factorial design, factorial ANOVA design, multi-factor experiment, crossed-factor design
ذات صلة	5	6
الملخص	A blocked laboratory experiment is a controlled laboratory study in which experimental units are grouped into homogeneous blocks before treatment assignment, and treatments are then randomly assigned within each block. Blocking removes the influence of a known nuisance variable — such as participant batch, equipment run, or testing day — from the error term, increasing the precision of treatment comparisons without expanding sample size.	A factorial experiment is an experimental design in which two or more independent variables (factors) are manipulated simultaneously, and every combination of their levels is tested. Introduced by Ronald Fisher in the 1920s–1930s, it is the standard approach whenever a researcher needs to detect not only the main effect of each factor but also whether the effect of one factor depends on the level of another — the interaction effect.